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I do the same as, Michelle and Ann, always leave it in tow haul going up a steep hill I will manually down shift to keep the rpm's up and keep moving. When in this towing mode I keep a watchful eye on temp, trans temp and rpm. Never had a problem....so far..
Tony
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2018 3920fb 2020 GMC Denali 3500 4x4 Duramax, 10 speed Allison. LB SRW, Firestone air bags with Airlift wireless onboard compressor. Anderson Ultimate Hitch. MX4 folding cover. 50gal titan in bed transfer tank. Onan 6500 lp genset installed by me ! Had: 2 HF 3500 Inverters with Parallel Kit
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